Nuclear Plants Raise Alerts in Sweden

STOCKHOLM—Sweden's three nuclear-power plants raised their security-alert level Thursday, a day after explosives were found on a forklift truck at the Ringhals nuclear-power plant.

Suspicious material about the size of a fist was found by personnel carrying out normal security checks with a sniffer dog, and police sent a sample of the material by helicopter to a crime laboratory, which confirmed that it was explosive. However, the material had no ignition device.